Pothos dolichophyllus Merr.

• Genus: Pothos
• Botanical Background: Described by botanist Elmer Drew Merrill in 1916. Later treated as a variety of P. rumphii by Dan H. Nicolson in 1967 based on leaf morphology.

• Geographical Range: Endemic to lowland rainforests of Luzon, Philippines; recorded near Mt. Bulusan and Lucban at elevations around 300 m.
• Environment: Thrives under shaded canopy with high humidity and stable temperatures. Grows in humus-rich, well-drained soils of tropical evergreen forests.

Leaves

• Glossy, dark green, narrow lanceolate blades measuring 20–35 cm long by 3–5 cm wide

• Slightly coriaceous texture

Inflorescence (Spadix & Spathe)

• Typical Araceae structure
• Small, cream-white spathe enclosing a compact spadix
• Likely pollinated by forest-dwelling beetles

Growth Habit

• Evergreen, root-climbing liana with adhesive aerial roots
• Arises from a creeping rhizome with occasional tuberous swellings

Light Requirements

• Bright, indirect light mimicking understory conditions

• Avoid direct sun to prevent leaf scorch 

Watering & Humidity

• Water when the top 1–2 inches of soil dry
• Maintain humidity above 50% for optimal growth 

Soil & Potting Mix

• Use a chunky, well-aerated aroid mix combining orchid bark, perlite, and peat or coco coir 
• Ensure containers have drainage holes

Temperature & Fertilizer

• Ideal range 18–30 °C
• Feed monthly during active growth with a balanced, water-soluble fertilizer

Division

• Rhizome division can also be used for older clumps

Stem Cuttings (if applicable)

• Most easily propagated by stem cuttings

• Include at least one node and aerial root

Seeds

• Rare due to low availability and requires warm, moist conditions with light exposure for germination

Typical Issues

• Susceptible to spider mites, mealybugs
• Root rot in poorly drained soils

Treatment Recommendations

• Isolate affected plants
• Use neem oil or insecticidal soap for pests
• Improve drainage and reduce watering to combat root rot

• The species name dolichophyllus means "long-leaved," reflecting its most striking feature
• In native forests, it provides habitat for small invertebrates

• Valued by aroid collectors for its rare, narrow foliage and climbing habit

• aAdding vertical interest in terrariums and shaded gardens

Wild Population Status

• Not formally assessed by IUCN
• Limited known range suggests monitoring may be warranted

Market Availability

• Rare in cultivation
• Occasionally available through specialist aroid nurseries and plant societies